Combined door check and spring.



No. 639,8l6.

Patented Dec. 26, i899. J. J. LARIMER. y COMBINED D008 CHECK AND SPRING. (Application filed Mar. 80, 1899.) (No Model.)

2 Sheets-Sheet I.

im 's 'ma Nonms Perzns co.. Pumomuo.. wAsnmorcN. n. c.

Nn. asa-als. APatented nec. 26, |399.v

J. Limmen. y 1 COMBINED DOORGHECK AND SPRING.

(Application filed Mar. 30, 1899.)

2 Shebts--Sheet 2.

(No Model.)

Arron/vir,

Nrrsn STATES PATENT lirica.

JOHN J. LARIMER, OF ORABTREE, PENNSYLVANIA.

COIVIBINED DOOR CHECK AND SPRING.

SPECIFCATION forming part of Letters Patent N o. 639,816, dated December 26, 1899. Application filed March 30, 1899. Serial No. 71]. ,094. (No model.)

To aldil/71,0711 it may concern:

Be it known that I, JOHN J. LARIMER, a citizen of the United States, residing at Crabtree,

in the county of Westmoreland land State of Pennsylvania, have invented new and useful Improvements in a Combined Door Check and Spring, of which the following is a specification.

This invention relates to an automatic door check and spring; and the objectlthereof is to provide a simple and improved device of the type embodying a spring for resisting opening of the door and a pneumaticcheck for preventing closing thereof with a slain.

The invention resides in the novel features a plan, showing the method of applying myA improvement to the inner side of an outwardly-swinging door. Figs. 8, 9, and l0 are detail views of the spring-actuated arm. v

Referring to the drawings, A is a bracket secured to the inner side of door X, said bracket being formed with top ear or projection B, apertured to receive short pintle d at the inner end of projecting'arm D, while the bottom and longer pintle CZ bears in bottom bracket-ear B', backwardly slotted at b and formed on top with curved boss b. Arm D is held with its pintles in the position indicated by coiled spring E, which resists rotation ot' the arm by having its lower extremity in engagement with one of shoulders b, while its upper extremity is confined in one of undercut slots d" in the circular inner end of arm D. Boss b forms the rear side of the lower pintle-bearing, and also holds the spring from contact with the pintle. To remove the arm from the bracket, as when dismounting the check or for changing the engagement of the spring to vary its tension, it is only necessary to depress the arm against the resistance of the spring, so as to free top pintle d',

and then turn it to one side in direction indicated by dotted lines, Fig. l0.

Link Fis pivoted to the extremity of arm D, as indicated at F, and extends backward to the door-frame, to which it is hinged in bracket f, and t-his bracket is arranged at such a point with relation to door-hinge X and pintlesd CZ that the door may open wide before arm D and link F aline. Otherwise full opening ofthe door would be prevented.

Secured to the frame above the door is cylinder G, its open end being toward arm D and formed at its closed end with threaded vent G to receive screw g, and the latter is formed with a tapering flat g to vary the ingress and egress of air to and from the cylin-v der. Within the cylinder is an elongated piston, which is made up of the telescoping neck parts H and I, threaded together at h and formed with disks H and I', respectively, which form the piston-heads. Oup-leatherJ is conlined on neck part H and against disk H by neck part l. The diameter of the latter is much less than that of the disks, so that there is ample room between the cylinder and neck I for the free portion of the leather to play. Thetendency of leathers when conlined as here shown is to spread, and much better results are had when the working edges are not confined, but have suflicient room for play, as herein provided for. Eyebolt K eX- tends centrally through the piston and is secured by nut K', the' bolt having slight longitudinal play. The extremity of neck part H is notched, so that nut Kdoes not seal thereagainst upon the outward stroke of the piston, as when opening the door, so that air may pass the bolt to the rear of the piston and prevent the formation of a partial vacuum; but when the movement is reversed, as when closing the door, the bolt moves back, bringing leather washer L, carried by the bolt, against disk HQ thus sealingthe bolt-passage against egress of air and forming the latter vprovided in order to prevent cramping in the cylinder resulting from lateral strain on the piston-rod. It is also necessary that the leather shall have the freest possible action, and to this end it must notbe subjected to roo any twisting or other motion save its longitudinal reciprocation. Myimproved plunger is designed with special view to meeting these requirements, which it does most effectually. The piston-heads are wide apart and yet so nearly fit the cylinder without friction ally binding it that cramping is impossible. Between the heads is ample room for the leather to work, the heads holding it against any dis-A torting tendency or from becoming a factor in causing the plunger to bind or stick.

Link M, extending from bolt K, connects closing thereof, and this may also be regulated to a nicety by the cylinder vent-screw.

Screen-doors are usually hung so as to swing outward from the door-frames, with no portion of the frame immediately above the door to support the check-cylinder, and in order to adapt my check and spring to'doors so `mounted I arrange the parts as'shown in Figs. (i and 7, wherein both the spring and checkcylinderare secured to the door. This arrangement necessitates connecting pistonlink M directly to spring-arm D, the outer end of the latter being anchored by link N to the door-jamb. In this style of mounting arm D is preferably inverted, with its longer pintle d uppermost, and in springs of small size the notched enlargement of arm D for confining the spring extremity may be dispensed with by forming the arm with fiange O for holding the spring end.

Having thus fullydescribed myinvention, what I claim as new, and desire to secure by Letters Patent, is-H 1. In a door-check, the combination of a cylinder, a long-length piston therein, the piston comprising separated heads IAI' and I', elongated telescoping necks I-Iand I carried by the heads, neck H interlocking with head I' and neck I stopping short of head I-I, the heads and necks forming an elongated periph eral space, and leather J confined between head H' and neck I, with its outer periphery disposed toward head I', the leather freely working in the said peripheral space and maintained in proper position by the heads without binding or sticking tendency, substantially as shown and described.

2. An improved resistance device for doorchecks comprising bearings, an arm, pintles v on the arm extending into thebearings, and a spring for holding the pintles in the bearings and also for resisting rotation of the arm, substantially as shown and described.

3. An improved resistance device for doorchecks, consisting of a bracket having proj ectin g bearings, an ontwardly-extendin g arm having a long and a short pintle adapted to turn in the bracket-bearings, the pintles projecting in opposite direction and entering the bearings on the inner or adjacent sides of the latter, and a spring for holding the pintles from longitudinal displa cement,substantially as shown and described.

4. An improved resistance device for doorchecks, consisting of a bracket having proj ectin g bearings, an outwardly-extendingarm adapted to be positioned between the bearings and having oppositely projecting pintles which enter the bearings, and an expansion.

spring coiled about one of the pintles and positioned between one of the bearings and the arm, with the spring ends secured to said parts, whereby the pintles are held in'position in the bearings and turning of the arm is resisted, substantially as shown and dcscribed. j

5. An improved resistance device for doorchecks, consisting of a bracket having top and bottom projecting bearings, one of the bearings being centrally apertured and the other bearing formed with a closed slot, the slotted bearing being formed on `its inner side with a boss, an outwardly-projecting arm having its inner end positioned between the bearings, a short pintle projecting from the arrn into the centrally-apertured bearing, a long pintle extending into the other bearing between the forward end of the slot and the boss, and an expansion-spring coiled around the long pintle, one end of the spring embracing the bearing-boss and secured to the bearing, and its opposite end secured to the arm, substantially as shown and described.

In testimony whereof I have hereunto set my hand in presence 0f two subscribing witnesses.

JOI-IN J. LARIMER. Witnesses:

J. M. Nitsni'r, F. E. GAITHER.

ICO 

